Fucked around and found out - how to fix?

I have been on quite the adventure while trying to upgrade the wifi + BT on my Mac Pro 5,1 with the BCM94360CD card.

After trying several fixes, in a somewhat desperate measure, I imported the “BCM Wireless Kexts” (or something similar) while I had my config.plist open via OpenCore Configurator. Rebooted, and now the machine never gets past the Apple logo, nary a progress bar. After about a minute, it restarts and the process repeats. Clearly I messed up my EFI, but I can not even enter recovery mode to fix it. I have backups and am recreating a bootable installer as we speak, but is this saveable in any other manner?